Rear bumper diffuser for a vehicle



FIG. 1 is a left perspective view of a rear bumper diffuser for a vehicle according to our design;

FIG. 2 is a right perspective view thereof;

FIG. 3 is a bottom, left perspective view thereof;

FIG. 4 is a bottom, right perspective view thereof; and,

FIG. 5 is a front view thereof.

The broken lines shown in the drawings illustrate portions of the rear bumper diffuser for a vehicle that form no part of the claimed design. 

CLAIM The ornamental design for a rear bumper diffuser for a vehicle, as shown and described. 